Não informado. (2008). The University of Iowa Studies in Natural History. University of Iowa.
Lua i Stíl Chicago (17ú heag.)Não informado. The University of Iowa Studies in Natural History. Iowa City, Iowa: University of Iowa, 2008.
Lua MLA (8ú heag.)Não informado. The University of Iowa Studies in Natural History. University of Iowa, 2008.
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